Thread-retaining bar for twisting-machines.



N0.v41,518.` .PATENTBD' 001.13, 190s.'

w. A. MACKIE.'

THREAD RETAINING 'BAR FOR TWIS'I-'INGrl MACHINES.

PPLIGATIONKv FILED JUNE 27, 1903. l No'n'onnL. Y K W, /Y 2 SHEETS-SHEET1.

I o. 7441,52fl.

UNITED STATES :Patented october 13,19os.

PATENT OFFICE.

THREAo-RETAlNiN-e BAR FOR TwlsTlNe-MACHINES.

SPECIFICATION forming part of Letters Patent No. 741,518, dated October13, 1903.

j Application filed J une 27, 1903.

To all whom it may concern:

Be it known that I, WILLIAM A. MACKIE, a citizen of the United States,residing at Providence, in the county of Providence and State of RhodeIsland, have invented certain new and useful Improvements inThread-Retaining Bars, of which the following is a specification,reference being had therein to the accompanying drawings.

Like letters indicate like parts.-

Figure 1 is a view of my invention as seen partly in side elevation andpartly in crosssection. Fig. 2 is an end elevation of a yarntwistingmachine and illustrates the series of gears by which the power iscommunicated to the operative parts of the machine. Fig. 3 is a frontelevation of a yarn-twisting machine to which my improvedthread-retaining'bar is applied. Fig. 4 is a side elevation of myimproved retaining-bar for a yarn-twisting machine. Fig. 5 is a frontelevation of the same. Fig. 6 illustrates the common construction of ayarn-twisting machine.

My invention is a device applicable to ma-y chines for twistingcotton'or woolen yarns and constitutes a protecting device orretaining-bar by which when the yarn' breaks its loose end is held andprevented from catching on another yarn or upon a roll where it does notbelong.

Said invention consists.L of the novel construction and combination ofthe several parts, as hereinafter described, and specifically set forthin the claims.

In the drawings in Fig. 2 is shown an end elevation of a yarn-twistingmachine, and in Fig. 3 a front elevation of the same. VA B are parts ofthe frame of said machine. Gis the main shaft, driven b y'power, and Dis a driving-gear fastened on and rotating with the main shaft C. Thedriving-gear D meshes with the gear E, Whose shaft F is rotatablymounted in a journal G in the frame A. The shaft F has said gear Efastened on it at one end, and on its outer end is fastened a pinionI-I. The pinion H'engages with the gear r I, which is mounted by itsshaft .I in a journal K of the frame A. The gear I engages with a gearL, fast upon a shaft M, which is rotatably mounted in journals in thestandards N at both ends of the machine, said shaftM extending theentire length of the ma- Serial No. 163,383. (No model.)

chine. The gear I also engages with a gear O of equal size with itselfand having the same number of teeth. The gear O is mounted by its shaftP in a journal on the frame A and engages withY a gear Q, fast upon ashaft R, which is mounted in standards S at both ends of the machine andextends` the entire length of the machine.Y On the top a of thetwisting-machine are creels bb, on which the spools c c' of yarn arerotatably mounted. On the front edge of the top a is pivotally mountedlthe usual thread-board d, having the guides e. A stand f is secured bybolts g or other.- wise to the top a of the machine and has twoangularly-projecting arms h and t', extending upwardly in front. Thestand f is provided with a U -shaped socketin which the traversebar j isloosely mounted and movable as usual. The bar j supports the guides k.The arm h has a U-shaped socket in which, as a bearing, the shaftZ ofthe top roll m is j ournaled. The bottom roll M is rotatably mounted byits journals in the arm tof the stand fin a socket' made for thatpurpose and shown in Fig.l in dotted lines. In the step-rail o a spindlep is rotatably mounted, which is providedwith a whirl q.' A pulley r ona shaft sis rotated by gearing, as usual, and a belt from the pulley rpasses around the whirl q and rotates the spindle p, together with thespool u, which is upon said spindle. The ring-,rail is shown at o andthe ring atw. Qn thering lw the ringtraveler .fr moves, as usual. Fromthe spool c is unwound the yarn y and from the spool c' the yarn z, asAreliiresented in Fig. l. The yarnsy and z pass through the eye of theguide 7c, thence to the bottom of the top roll m and up and over saidroll 'm once, and thence to the' top of the bottomroll' Mand `passingbetween said rolls m and M is drawn to the front. The top rolls mareseparate and each is journaled in the bearings which are beside them, asusual; but the bottom roll M is a single roll mounted fast on the shaftM and extending along the machine from endto end, as heretofore commonin yarn-twisting machines. In my improved device the bottom roll M'rotates in a direction which is the reverse of the direction of itsrotation hereto- IOO `fore common, and as the top rollm is rotatedsimply by its contact with the bottom roll M 'its direction of rotationis` the reverse of the usual direction of rotation of such top rolls.This is caused by the gearing shown in Fig. 2, in which figure thedirection of the rotation of each of the gears is indicated by an arrowthereon. The gear L rotates the shaft M, on which the roll M isfastened, as seen in Fig. 2.

My improved thread-retaining bar consists of two downwardly-hanging armsT T, each having a circular aperture near the top and a circular.aperture near the bottom. It also has a boss n, provided with a straightedge,l as seen in Fig. 4E. The top rolls m are in a series and usuallydivided into sections, and at both ends of each of these sections thereis a standard U. A cap or plate V is supported on the top ofthe standardUand is longitudinally slotted, as indicated by dotted lines in Fig. 4.It is secured in position by a bolt W, which engages in a threaded holetapped therefor in the frame. A pivot X passes through ears Y of thecap-piece V and through the upper hole or aperture in the hangingarms'l.A rod or bar Z is mounted in the lower holes or apertures of the hangingarms Tand is securedin position by nuts on the ends of the rod or bar Z,as illustrated in Figs. t and 5.

As is well known, it is a frequent occurrence in twistingyarns thateither one or both of the yarns break in passing from the rolls to thespool, and the loose ends of the yarn or yarns so broken are liable tofiyout and catch onto the yarn passing from the adjacent rolls to thespool thereto belonging or upon one of the adjacent top rolls, thusmaking these adjacent yarns three or four ply or else clogging the toprolls, thus resulting in waste and loss. The attendant cannot alwaysquickly detect this breakage and consequent damage, and there isconsiderable loss of material thus occasioned. In Fig. G I haveillustrated the usual manner of rotation of the top and bottom rolls andthe course of the yarns in the operation as heretofore common. Itis hereseen that the yarn passes to the top of the top roll, thence down overthe saine in front, thence between the top and bottom rolls to the rear,and thence down back of the bottom roll to and through the guide, and soto the ringtraveler. In this manner the yarn cannot be wound onceentirely around the top roll. This difficulty is prevented by myimproved thread-retaining bar, which hangs loosely in front ot' therolls m M and takes the yarn or thread from the top of the roll M. Thepractical eect of this device in operation is that the loose end of thebroken yarn is caught up and wound around the top roll m to which itproperly appertains and cannot catch onto the next adjacent roll noronto the yarn of either next adjacent top roll. As a consequence thereis no increase in the number of the plies of these adjacent yarns. Thereason Why the broken yarn is taken up by the top roll m to which itbelongs is that yarns y .e are wrapped once around said top roll m andthe loose end of the broken yarn adheres to the yarn which is wrappedaround said top roll by capillary contact therewith if the break occursat a place between the bottom roll M' and the cross-bar Z, or if thebreak occurs between the cross-bar Z and the ringtraveler the loose endof the broken yarn is prevented by the cross-bar Z from coming intocontact with the bottom roll M', as said cross-bar is at a sufiicientdistance in front of the bottom roll to protect the loose end from suchcapture.

My improved thread-retaining bar has several important advantages overprevious devices for the saine purpose. Many of those devices arecomplicated, expensive, and unreliable. Some of them are so heavy thatthey add several hundreds ot' pounds to the weight of eachtwisting-xnachine. Some of them occupy considerable space, preventingconvenient access to the rolls and partially concealing the rolls andyarn, so that any improper working or condition of them is not readilydiscovered. Some of them require oiling and considerable care.

My improved thread-retaining bar is exceedingly simple, very cheap, andalways reliable. It is very light and small, does not interfere withaccess to the rolls or yarn, and does not conceal or cover them. It doesnot require oiling or any care.

NVhereas the common construction and operation of the rolls inyarn-twisting machines (illustrated in Fig. 6) results in an angularcourse of the yarn from the rear of the bottom roll to the guide on thethread-board, so causing the yarn to bend in passing through said guideand to drag in passing over the rear side of said guide, it is evident,as seen in Fig. l, that the yarn in passing over on the front side ofthe cross-bar Z is exactly vertical and in line with the axial line ofthe spindle p. The result is that the expansion of the yarn as thering-traveler moves on the ring w is uniform and the tension isinvariable.

It is a com mon habit with operatives work ing on yarn-twisting machineslike that illustrated in Fig. (i to take up a large number of yarns atonce and place them on the rolls, and this causes a considerable Waste;but in the use of my said device the yarn can be put upon only vone toproll at a time, and all loss from this cause is prevented.

In the common twisting-machine (shown in Fig. 6) it is evident that theyarn in passing between the rolls must be passed to the rear, and itgoes from the back side of the lower roll to the guide on thethread-board. This is inconvenient, because the back of the roll is notvisible to the operator and is less accessible than the front; but in mysaid device the end ot' the yarn in passing between the rolls comes tothe front, and it also passes from the lower roll in the front of saidroll, so that it is always accessible and visible.

In the use of the common twisting-machine (shown in Fig. G) if a bit ofdirt or foreign ICO IIO

substance or other obstacle is upon the yarn or gets between the rollsthe top roll is lifted thereby as the same passes between the top andbottom rolls, and thus the yarn becomes slack while the top rollis solifted and the proper tension is temporarily disturbed. In my saiddevice this slackening of the yarn by this cause is prevented, as theyarn passes entirely around the top roll instead of passing onlytangentially between the rolls, as in the prior machines, and thus theproper draft upon the-yarn is maintained uniformly. The straight edge ofthe boss n of the hanging arm T, coming in contact with the straightvertical surface of the adjacent portion of the frame of the machine,insures the proper vertical direction of the armT during the operationof the machine and the consequent movement of the yarn downward in avertical line in the line-of the spindle p to the spool ru, and theuniform expansion of the yarn by the ring-traveler in the twistingoperation. By means of the slot in the cap-piece V the said piece isadjustable vin position longitudinally and is held in its adjustedposition by thebolt W. Whenever it is desired to haveaccess to thebottom rolls, the pivotal mounting of the arms T T allow said arms to beswung up, thus elevating the cross-bar Z to a position much above thetop rolls m.

I'claim as a novel and useful invention and desire to secure by LettersPatent- Y l. In a yarn-twisting machine having a top roll and a bottomroll, the combination therewith of a cap piece or plate mounted on theframe of the machine in a horizontal plane above the top roll andprovided with a longitudinal slot and two forwardly-projecting ears, ahanging arm pivotally connected at its top with said ears', a rodextending. at a right angle from said hanging arm at the bottom thereofin front of said bottom roll, and a bolt passing through said slot intothe frame, substantially as described.

2. In a yarn-twisting machine having a top roll and a bottom roll, thecombination therewith of a cap piece or plate mounted on'the frame ofthe machine in a horizontal plane above the top roll and provided with alongitudinal slot and two forwardly-projecting ears, a hanging armpivotally connected. at

vits top with said ears and having a rearwardlyextendingi boss which isprovided with a straight edge adapted to contact with the verticalsurface of a portion of said frame, a rod.

extending at a right angle from said hanging arm at the bottomthereofsin front of said bottom roll,.and a bolt passing through saidslot into the frame, substantially as specified.

In testimony whereof I a'x my signature in presence of two witnesses.

WILLIAM A. MACKIE.

Witnesses:

' WILLIAM W. REYNoLDs,' HOWARD A. LAMPREY.

